01 - In a large mixing bowl, whisk together the olive oil, lemon juice, Greek yogurt, minced garlic, red wine vinegar, dried oregano, dried thyme, salt, black pepper, and lemon zest until fully combined and smooth.
02 - Add the cubed chicken to the marinade and toss until every piece is evenly coated. Cover the bowl with plastic wrap and refrigerate for a minimum of 1 hour, or up to 8 hours for deeper flavor penetration.
03 - If using wooden skewers, submerge them in water for at least 30 minutes to prevent burning on the grill.
04 - Thread the marinated chicken pieces onto skewers, alternating with red onion chunks, red bell pepper pieces, yellow bell pepper pieces, and zucchini rounds. Distribute the ingredients evenly across all skewers.
05 - Preheat an outdoor grill or grill pan to medium-high heat. Lightly oil the grates to prevent sticking.
06 - Place the skewers on the grill and cook for 6 to 8 minutes per side, turning once, until the chicken is cooked through to an internal temperature of 165°F and has developed a light char on the edges.
07 - Remove the kabobs from the grill and serve immediately alongside fresh lemon wedges, a sprinkle of chopped parsley, and tzatziki sauce on the side.